Clog Almanac

A primitive almanac or calendar, originally made of a “clog,”
or log of wood, with four faces or parallelograms, the sharp edge of
each face or side was divided by notches into three months, every week
being marked by a big notch. The face left of the notched edge
contained the saints' days, the festivals, the phases of the moon, and
so on in Runic characters, whence the “clog” was also called a Runic
staff. These curiosities are not uncommon, and specimens may be seen in
the British Museum, the Bodleian (Oxford), the Ashmolean Museum, St.
John's (Cambridge), the Cheetham Library (Manchester), and other places
both at home and abroad.